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Thread: High PH

  1. Back To Top    #1

    Join Date
    Aug 2008
    Location
    Northwest New Jersey
    Posts
    5

    High PH

    Hello all -

    Hope to get some advice here.

    Heres the last several weeks . . . I was on vacation for three weeks and came home to some brown mold (brown-yellowish dots on the upper sides of the pool - cc 0.5). Killed the brown mold with high shock for 3-4 days, 24hr running of the pump (Bleach +15ppm @ CYA 40). Checked all the other numbers and everything fine. I have been back from vacation last two weeks and have had no time to really keep an eye on the pool except to keep the chlorine level between 3-5ppm with bleach (I add one jug every 2-3 dyas). Last time I checked the PH it was high (~1 week ago) and I lowered it to about 7.2 with acid (checked this with test kit aftwerward). So yesterday, I saw some small patchs of the brown mold and I checked the FC and it was less then 1ppm and the PH was off the scale (8.2+). I added in muriatic acid (enough to bring it down to around 7.6 and I added in 6 jugs of Bleach (15ppm). So here are my numbers as of this am

    FC - 15ppm
    CC - >0.5
    PH- >8.2 (This seems to high!!!! As I just added muriatic acid yesterday @ 2 liters)
    ALK - 90
    CAL - 200
    CYA - 30-40
    SALT - 3300

    I have IG cement pool with SWG (30K).

    My question is will the high chlorine be giving me a false PH reading?

    Your thoughts appreciated.

    Thanks
    Jaypea
    BBB Believer for past 3 years
    30K gallon IG cement pool
    SWG
    400K Btu Heater
    6ft Sheer Descent (great for aerating)
    Mars HP pool cleaner (works great but fragile)

  2. Back To Top    #2
    TizMe's Avatar
    Join Date
    Aug 2007
    Location
    Covington, Georgia
    Posts
    920

    Re: High PH

    When shocking your pool you will get false PH readings (on the high side). You should wait until your algae is gone and your FC lowers to below 10 ppm to test your PH. If your PH was 7.2 before you shocked chances are its still ok.
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
    Helpful Links:
    Pool School,Pool Calculator,Cl/CYA Shock Chart,TF Test Kit
    Doing BBB and loving it!

  3. Back To Top    #3

    Join Date
    Aug 2008
    Location
    Northwest New Jersey
    Posts
    5

    Re: High PH

    Thank you for the quick reply, I thought that was the case.

    regards
    Jaypea
    BBB Believer for past 3 years
    30K gallon IG cement pool
    SWG
    400K Btu Heater
    6ft Sheer Descent (great for aerating)
    Mars HP pool cleaner (works great but fragile)

  4. Back To Top    #4
    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
    Posts
    10,157

    Re: High PH

    Hi and Welcome to TFP~

    Looks like you should also raise your CYA if you're running a SWG. Like to 70-80.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  5. Back To Top    #5
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: High PH

    Welcome, again

    Along with other fantastic information, our Pool School has an article on Water Balance for SWG's.

    There is a link to Pool School at the top of each page in the sub-heading and a link in my sig.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  6. Back To Top    #6

    Join Date
    Aug 2008
    Location
    Northwest New Jersey
    Posts
    5

    Re: High PH

    Thank you I will check that out!
    BBB Believer for past 3 years
    30K gallon IG cement pool
    SWG
    400K Btu Heater
    6ft Sheer Descent (great for aerating)
    Mars HP pool cleaner (works great but fragile)

  7. Back To Top    #7
    Guest

    Re: High PH

    Besides the pool school article you should read this one also:
    viewtopic.php?f=21&t=3663

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